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/*****************************************************************************\
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://github.com/behlendorf/spl/>.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
*****************************************************************************
* Solaris Porting Layer (SPL) Credential Implementation.
\*****************************************************************************/
#include <sys/cred.h>
#ifdef DEBUG_SUBSYSTEM
#undef DEBUG_SUBSYSTEM
#endif
#define DEBUG_SUBSYSTEM S_CRED
#ifdef HAVE_GROUPS_SEARCH
/* Symbol may be exported by custom kernel patch */
#define cr_groups_search(gi, grp) groups_search(gi, grp)
#else
/* Implementation from 2.6.30 kernel */
static int
cr_groups_search(const struct group_info *group_info, gid_t grp)
{
unsigned int left, right;
if (!group_info)
return 0;
left = 0;
right = group_info->ngroups;
while (left < right) {
unsigned int mid = (left+right)/2;
int cmp = grp - GROUP_AT(group_info, mid);
if (cmp > 0)
left = mid + 1;
else if (cmp < 0)
right = mid;
else
return 1;
}
return 0;
}
#endif
#ifdef HAVE_CRED_STRUCT
/*
* As of 2.6.29 a clean credential API appears in the linux kernel.
* We attempt to layer the Solaris API on top of the linux API.
*/
/* Hold a reference on the credential and group info */
void
crhold(cred_t *cr)
{
(void)get_cred((const cred_t *)cr);
(void)get_group_info(cr->group_info);
}
/* Free a reference on the credential and group info */
void
crfree(cred_t *cr)
{
put_group_info(cr->group_info);
put_cred((const cred_t *)cr);
}
/* Return the effective user id */
uid_t
crgetuid(const cred_t *cr)
{
return cr->euid;
}
/* Return the real user id */
uid_t
crgetruid(const cred_t *cr)
{
return cr->uid;
}
/* Return the saved user id */
uid_t
crgetsuid(const cred_t *cr)
{
return cr->suid;
}
/* Return the effective group id */
gid_t
crgetgid(const cred_t *cr)
{
return cr->egid;
}
/* Return the real group id */
gid_t
crgetrgid(const cred_t *cr)
{
return cr->gid;
}
/* Return the saved group id */
gid_t
crgetsgid(const cred_t *cr)
{
return cr->sgid;
}
/* Return the number of supplemental groups */
int
crgetngroups(const cred_t *cr)
{
struct group_info *gi;
int rc;
gi = get_group_info(cr->group_info);
rc = gi->ngroups;
put_group_info(gi);
return rc;
}
/*
* Return an array of supplemental gids. The returned address is safe
* to use as long as the caller has taken a reference with crhold().
* The caller is responsible for releasing the reference with crfree().
*/
gid_t *
crgetgroups(const cred_t *cr)
{
struct group_info *gi;
gid_t *gids;
gi = get_group_info(cr->group_info);
gids = gi->blocks[0];
put_group_info(gi);
return gids;
}
/* Check if the passed gid is available is in supplied credential. */
int
groupmember(gid_t gid, const cred_t *cr)
{
struct group_info *gi;
int rc;
gi = get_group_info(cr->group_info);
rc = cr_groups_search(cr->group_info, gid);
put_group_info(gi);
return rc;
}
#else /* HAVE_CRED_STRUCT */
/*
* Until very recently all credential information was embedded in
* the linux task struct. For this reason to simulate a Solaris
* cred_t we need to pass the entire task structure around.
*/
/* Hold a reference on the credential and group info */
void crhold(cred_t *cr) { }
/* Free a reference on the credential and group info */
void crfree(cred_t *cr) { }
/* Return the effective user id */
uid_t
crgetuid(const cred_t *cr) {
return cr->euid;
}
/* Return the effective real id */
uid_t
crgetruid(const cred_t *cr) {
return cr->uid;
}
/* Return the effective saved id */
uid_t
crgetsuid(const cred_t *cr) {
return cr->suid;
}
/* Return the effective group id */
gid_t
crgetgid(const cred_t *cr) {
return cr->egid;
}
/* Return the real group id */
gid_t
crgetrgid(const cred_t *cr) {
return cr->gid;
}
/* Return the saved group id */
gid_t
crgetsgid(const cred_t *cr) {
return cr->sgid;
}
/* Return the number of supplemental groups */
int
crgetngroups(const cred_t *cr)
{
int lock, rc;
lock = (cr != current);
if (lock)
task_lock((struct task_struct *)cr);
get_group_info(cr->group_info);
rc = cr->group_info->ngroups;
put_group_info(cr->group_info);
if (lock)
task_unlock((struct task_struct *)cr);
return rc;
}
/*
* Return an array of supplemental gids. The returned address is safe
* to use as long as the caller has taken a reference with crhold().
* The caller is responsible for releasing the reference with crfree().
*/
gid_t *
crgetgroups(const cred_t *cr)
{
gid_t *gids;
int lock;
lock = (cr != current);
if (lock)
task_lock((struct task_struct *)cr);
get_group_info(cr->group_info);
gids = cr->group_info->blocks[0];
put_group_info(cr->group_info);
if (lock)
task_unlock((struct task_struct *)cr);
return gids;
}
/* Check if the passed gid is available is in supplied credential. */
int
groupmember(gid_t gid, const cred_t *cr)
{
int lock, rc;
lock = (cr != current);
if (lock)
task_lock((struct task_struct *)cr);
get_group_info(cr->group_info);
rc = cr_groups_search(cr->group_info, gid);
put_group_info(cr->group_info);
if (lock)
task_unlock((struct task_struct *)cr);
return rc;
}
#endif /* HAVE_CRED_STRUCT */
EXPORT_SYMBOL(crhold);
EXPORT_SYMBOL(crfree);
EXPORT_SYMBOL(crgetuid);
EXPORT_SYMBOL(crgetruid);
EXPORT_SYMBOL(crgetsuid);
EXPORT_SYMBOL(crgetgid);
EXPORT_SYMBOL(crgetrgid);
EXPORT_SYMBOL(crgetsgid);
EXPORT_SYMBOL(crgetngroups);
EXPORT_SYMBOL(crgetgroups);
EXPORT_SYMBOL(groupmember);
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